Have look here, it's where I bought mine from. The driveline specialist that put it in for me said they used top quality bearings. And when the kit arrived even a layman like me could see it was awesomely made bit of kit, you could hang the alloy flywheel as a piece of art.
http://npcperformance.com.au
As for on road performance well so far it's awesome. The only problem I have heard off is driveline shudder if our not in the right gear. Haven't experienced it myself, and if you can drive an old manual car with no issues, you'll be fine. Dual mass clutches are for people who nanny their cars for optimum fuel economy, so they don't shake themselves silly. At least with a single mass clutch if you get a GDE Tune you won't have to worry about frying clutches.
There is a tiny bit more noise when in neutral, but with wind, tyres and a blaring stereo I don't notice it unless I get out with it running, and it's not enough of a noise to be annoying
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